That is called a society's 'prehistoric' era.
The period of time before writing was called prehistory. This refers to the time before written records were kept and information was transmitted orally or through other means.
Prehistory.
prehistory
new era
long period of time before people developed systems of writing and a written language
long period of time before people developed systems of writing and a written language
Prehistory
neolithic age
Prehistory
Prehistory is the period of time before humans learned to write.
prehistory
he was a maid